Year	Percent change (Units)
1980	4.700
1981	-6.700
1982	-3.400
1983	-11.400
1984	-1.600
1985	7.900
1986	-14.800
1987	6.700
1988	6.700
1989	13.500
1990	13.097
1991	7.508
1992	8.455
1993	7.804
1994	-1.493
1995	18.925
1996	6.836
1997	14.001
1998	25.402
1999	3.891
2000	13.723
2001	-7.172
2002	-0.330
2003	2.695
2004	4.467
2005	-1.383
2006	4.659
2007	9.584
2008	-0.466
2009	-1.821
2010	5.799
2011	2.900
2012	1.951
2013	5.975
2014	6.927
2015	2.838
2016	2.359
2017	1.490
2018	-0.370
2019	0.232
2020	-7.526
2021	10.258
2022	6.968
2023	-4.708
2024	2.890
2025	3.324
2026	3.514
2027	3.821
2028	4.241
2029	4.950